2004-2006 (2007) Honda TRX400FA Fourtrax Rancher / TRX400FGA Rancher AT GPScape Service Manual, Page 165Get this manual
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CYLINDER HEADVALVECAMSHAFT VAlVEIVAlVE GUIDE
Measure each valve guide J.Dand record itSERVICE LIMIT: 5.53 mm (0.218 in)
Subtract each valve stem O.Dfrom the corresponding gui